期刊
MATERIALS CHEMISTRY AND PHYSICS
卷 181, 期 -, 页码 397-408出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2016.06.075
关键词
Alloys; Coatings; SEM; Corrosion
资金
- Science and Technology Development Fund (FDCT) of Macau SAR [FDCT 070/2011/A3]
Surface modification of commercially pure copper (cp Cu) with W powder was achieved by using a high power diode laser (HPDL) resulting in a microstructure of micron-sized W particles in a Cu matrix. In both 3.5 wt% NaCl solution and synthetic acid rain (SAR), the laser-fabricated specimens possess lower corrosion current density (I-corr) than that of cp Cu despite the active shift in open-circuit potential (OCP). Although Cu is cathodic to W in 3.5 wt% NaCl solution, the Cu phase in the laser-fabricated specimens dominantly dissolves during the immersion test. This anomalous observation is possible because the OCP values of the laser-fabricated specimens, cp Cu and cp W are quite near to each other, while the anodic and cathodic current densities are all not negligible for the Cu and W phases at OCP. As the anodic current density of the Cu phase is greater than anodic current density of the W phase, the Cu phase corrodes more quickly than the W phase. For the laser-fabricated specimens immersed in SAR, the Cu phase is anodic and is selectively attacked while the W phase is passive due to the formation of WO3. (C) 2016 Published by Elsevier B.V.
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